# NLO QCD Corrections to Off-shell $t\,\bar{t}$ and $t\,\bar{t}\,H$ at the ILC

## TL;DR

This paper presents NLO QCD corrections for off-shell top-antitop and top-antitop-Higgs production at the ILC, integrating threshold and continuum calculations within the extwz event generator framework.

## Contribution

It introduces a validated matching procedure between resummed vNRQCD threshold and fixed-order NLO QCD continuum calculations for off-shell top processes at the ILC.

## Key findings

- Validated the matching of threshold and continuum calculations.
- Implemented calculations in the extwz event generator.
- Enhanced accuracy of top-quark process simulations at the ILC.

## Abstract

We discuss top-quark physics at the ILC with a focus on the full off-shell processes for $t\bar{t}$ and $t\bar{t}H$ production, including top-quark decays and also leptonic $W$ decays. A special focus is on the matching of the resummed vNRQCD threshold calculation and the fixed-order NLO QCD continuum calculation, where we present an update on the validation of the matching. All of the calculations have been performed in the \wz event generator framework.